Help on how to use KakaoTalk

I need help on how to use KakaoTalk abroad. I have a phone number which is currently in roaming mode in Korea. Of course I'm not using it to call my family in Turkey, because it would bankrupt me. It's just for emergency until I get a new simcard here.

Now here is the thing. Which phone number should I register for the app to work?

The international code for Turkey is 90. And Korea's is 82. When you open the app (as you might know) you need to pick one country (code), then enter your phone number.

I have tried the Turkey and entered my usual phone number. But I didn't get the SMS. What is the solution?